How Game of Thrones dragon eggs are made - GIF and video

I watched Game of Thrones a few times and got bored. But I still like the costumes, props, and scenery. Here's a how-to of making the "Dragon Eggs" in the series. I don't know if this is the craftsman that makes the dragon eggs used in the episodes, or not, or if the ones you see in the series aren't even made of metal at all. Doesn't really matter.